<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .aa{
            text-align: center;
            font-size: 40px;
            color: #c2c2c2;
            line-height: 200px;
        }
    </style>
</head>
<body>
<div class="aa">
    正在建设中...
</div>
</body>
</html>